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| author | Neil Turton <nturton@solarflare.com> | 2011-04-11 14:42:43 +0400 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2011-04-13 02:52:44 +0400 |
| commit | fcfa060468a4edcf776f0c1211d826d5de1668c1 (patch) | |
| tree | 3e8387932c5cc10facffa248ecfb648564a9ae5e /drivers/hwspinlock | |
| parent | d4fabcc8e8ecac21262b1a5b9684fe415b128bd2 (diff) | |
| download | linux-fcfa060468a4edcf776f0c1211d826d5de1668c1.tar.xz | |
sfc: Use rmb() to ensure reads occur in order
Enabling write-combining may also enable read reordering. The BIU is
only guaranteed to read from a 128-bit CSR or 64-bit SRAM word when
the host reads from its lowest address; otherwise the BIU may use the
latched value. Therefore we need to reinstate the read memory
barriers after the first read operation for each CSR or SRAM word.
Signed-off-by; Ben Hutchings <bhutchings@solarflare.com>
Diffstat (limited to 'drivers/hwspinlock')
0 files changed, 0 insertions, 0 deletions